Enthusiasm is a supernatural serenity.

None are so old as those who have outlived enthusiasm

None are so old as those who have outlived enthusiasm.

Curb Your Enthusiasm: The Complete Fourth Season

[Murdock's enthusiasm proved contagious.] He's got more energy than anybody I've ever met, ... North Carolina is lucky to have a man of that vision being so active in the state.

Explore your higher latitudes . . . be a Columbus to whole new continents and worlds within you, open new channels, not of trade but of thought.